There are a large number of files in the tree that define _GNU_SOURCE
despite not actually using features hidden behind this flag. This patch
removes all these definitions in one fell swoop...
The driver vtables are read-only structures. This patch declares them as
'const' allowing the compiler to (optionally) put them in the RELRO
section. RELRO pages may be marked as read-only by the linker after
the relocations have been done ensuring that they aren't inadvertently
or maliciously altered at runtime.
Huawei LTE modems use AT^SYSCFGEX and AT^SYSINFOEX instead of
AT^SYSCFG and AT^SYSINFO.
If we want to be able to attach on LTE with this modem, we must use
AT^SYSCFGEX to configure rat mode and band. Using AT^SYSCFG, mode any
means UMTS or GSM.